So-and-so and Unsolved

So-and-so noun - A person whose behavior is offensive to others.

Unsolved and so-and-so are semantically related. In some cases you can use "Unsolved" instead an adjective phrase "So-and-so".

Unsolved adjective - Not solved.

So-and-so and unsolved are semantically related. Sometimes you can use "So-and-so" instead an adjective "Unsolved".